Autumnal equinox, the time when the sun crosses
the equator, as it proceeds southward, or when it passes the autumnal
point. -- Autumnal point, the point of the
equator intersected by the ecliptic, as the sun proceeds southward; the
first point of Libra. -- Autumnal signs, the
signs Libra, Scorpio, and Sagittarius, through which the sun passes between
the autumnal equinox and winter solstice.